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| author | Ian Rogers <irogers@google.com> | 2023-04-19 16:48:37 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-04-19 16:53:01 +0300 |
| commit | 8f12692b7e61e5fb5d3e4f6692d6675f62eeebdc (patch) | |
| tree | c3c653ed2524b984c7b4ae279d6a096f344fd569 /tools/perf/util/unwind-libunwind-local.c | |
| parent | a07dacad8ac40d1beadb640fe341b5198c1cf097 (diff) | |
| download | linux-8f12692b7e61e5fb5d3e4f6692d6675f62eeebdc.tar.xz | |
perf maps: Add reference count checking
Add reference count checking to make sure of good use of get and put.
Add and use accessors to reduce RC_CHK clutter.
The only significant issue was in tests/thread-maps-share.c where
reference counts were released in the reverse order to acquisition,
leading to a use after put. This was fixed by reversing the put order.
Committer notes:
Extracted from a larger patch removing bits that were covered by the use
of pre-existing maps__ accessors (e.g. maps__nr_maps()) and new ones
added (maps__refcnt()) to reduce RC_CHK_ACCESS(maps)-> source code
pollution.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Link: https://lore.kernel.org/lkml/20230407230405.2931830-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/unwind-libunwind-local.c')
| -rw-r--r-- | tools/perf/util/unwind-libunwind-local.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c index f9a52af48de4..83dd79dcd597 100644 --- a/tools/perf/util/unwind-libunwind-local.c +++ b/tools/perf/util/unwind-libunwind-local.c @@ -677,7 +677,7 @@ static int _unwind__prepare_access(struct maps *maps) { void *addr_space = unw_create_addr_space(&accessors, 0); - maps->addr_space = addr_space; + RC_CHK_ACCESS(maps)->addr_space = addr_space; if (!addr_space) { pr_err("unwind: Can't create unwind address space.\n"); return -ENOMEM; |